Hi there! I am not the best person to answer the nitty gritty of your question, BUT I am a breastfeeding mom of a 16 month old and I do wonder if you need to eat more calories because you are nursing. At 8 months your baby probably still nurses quite a lot (do you nurse at night as well?) and this can rob you of 300-500 calories a day. If you are also active or exercising, you are burning even more.
I have only gone primal a week and the past three days I had a major drop in energy. I think it's the "carb flu" mixed with getting my period. Feeling better today, but OOF! Looking forward to coming out on the other side.
Hope you feel better!